package demo1;

public class Hello {
    public static void main(String[] args) {
        System.out.println("demo1.Hello, world!");
    }

}

class Dog{
    public static void main(String[] args) {
        System.out.println("Dog");
    }
}

class Cat{
    public static void main(String[] args) {
        System.out.println("Cat");
    }
}
